题目内容

The question that puzzled them is ____ they can get rid of the air pollution in the area.
A．how is it thatB．that is howC．what is thatD．how it is that
D

试题分析：考查强调句的特殊问句做表语从句：句意：那个令他们无法理解的问题是-怎么才能-他们才可以除掉这里的空气污染。强调句的特殊问句是：特殊疑问词+is it+that…，这里做表语从句，用陈述语序，所以选D。
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